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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1705

The pupils here________all kinds of exercises every day in the past four weeks.

A.kept busy doing
B.keep on doing
C.have kept busy doing
D.have been kept busy doing
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Thepupilshereallkindsofexercis